source: vendor/3.5.4/source3/passdb/machine_sid.c

Last change on this file was 414, checked in by Herwig Bauernfeind, 16 years ago

Samba 3.5.0: Initial import
File size: 6.5 KB
Line 
1/*
2 Unix SMB/CIFS implementation.
3 Password and authentication handling
4 Copyright (C) Jeremy Allison 1996-2002
5 Copyright (C) Andrew Tridgell 2002
6 Copyright (C) Gerald (Jerry) Carter 2000
7 Copyright (C) Stefan (metze) Metzmacher 2002
8
9 This program is free software; you can redistribute it and/or modify
10 it under the terms of the GNU General Public License as published by
11 the Free Software Foundation; either version 3 of the License, or
12 (at your option) any later version.
13
14 This program is distributed in the hope that it will be useful,
15 but WITHOUT ANY WARRANTY; without even the implied warranty of
16 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 GNU General Public License for more details.
18
19 You should have received a copy of the GNU General Public License
20 along with this program. If not, see <http://www.gnu.org/licenses/>.
21*/
22
23#include "includes.h"
24
25/* NOTE! the global_sam_sid is the SID of our local SAM. This is only
26 equal to the domain SID when we are a DC, otherwise its our
27 workstation SID */
28static DOM_SID *global_sam_sid=NULL;
29
30#undef DBGC_CLASS
31#define DBGC_CLASS DBGC_PASSDB
32
33/****************************************************************************
34 Read a SID from a file. This is for compatibility with the old MACHINE.SID
35 style of SID storage
36****************************************************************************/
37
38static bool read_sid_from_file(const char *fname, DOM_SID *sid)
39{
40 char **lines;
41 int numlines;
42 bool ret;
43
44 lines = file_lines_load(fname, &numlines,0, NULL);
45
46 if (!lines || numlines < 1) {
47 if (lines) TALLOC_FREE(lines);
48 return False;
49 }
50
51 ret = string_to_sid(sid, lines[0]);
52 TALLOC_FREE(lines);
53 return ret;
54}
55
56/*
57 generate a random sid - used to build our own sid if we don't have one
58*/
59static void generate_random_sid(DOM_SID *sid)
60{
61 int i;
62 uchar raw_sid_data[12];
63
64 memset((char *)sid, '\0', sizeof(*sid));
65 sid->sid_rev_num = 1;
66 sid->id_auth[5] = 5;
67 sid->num_auths = 0;
68 sid->sub_auths[sid->num_auths++] = 21;
69
70 generate_random_buffer(raw_sid_data, 12);
71 for (i = 0; i < 3; i++)
72 sid->sub_auths[sid->num_auths++] = IVAL(raw_sid_data, i*4);
73}
74
75/****************************************************************************
76 Generate the global machine sid.
77****************************************************************************/
78
79static DOM_SID *pdb_generate_sam_sid(void)
80{
81 DOM_SID domain_sid;
82 char *fname = NULL;
83 DOM_SID *sam_sid;
84
85 if(!(sam_sid=SMB_MALLOC_P(DOM_SID)))
86 return NULL;
87
88 if ( IS_DC ) {
89 if (secrets_fetch_domain_sid(lp_workgroup(), &domain_sid)) {
90 sid_copy(sam_sid, &domain_sid);
91 return sam_sid;
92 }
93 }
94
95 if (secrets_fetch_domain_sid(global_myname(), sam_sid)) {
96
97 /* We got our sid. If not a pdc/bdc, we're done. */
98 if ( !IS_DC )
99 return sam_sid;
100
101 if (!secrets_fetch_domain_sid(lp_workgroup(), &domain_sid)) {
102
103 /* No domain sid and we're a pdc/bdc. Store it */
104
105 if (!secrets_store_domain_sid(lp_workgroup(), sam_sid)) {
106 DEBUG(0,("pdb_generate_sam_sid: Can't store domain SID as a pdc/bdc.\n"));
107 SAFE_FREE(sam_sid);
108 return NULL;
109 }
110 return sam_sid;
111 }
112
113 if (!sid_equal(&domain_sid, sam_sid)) {
114
115 /* Domain name sid doesn't match global sam sid. Re-store domain sid as 'local' sid. */
116
117 DEBUG(0,("pdb_generate_sam_sid: Mismatched SIDs as a pdc/bdc.\n"));
118 if (!secrets_store_domain_sid(global_myname(), &domain_sid)) {
119 DEBUG(0,("pdb_generate_sam_sid: Can't re-store domain SID for local sid as PDC/BDC.\n"));
120 SAFE_FREE(sam_sid);
121 return NULL;
122 }
123 return sam_sid;
124 }
125
126 return sam_sid;
127
128 }
129
130 /* check for an old MACHINE.SID file for backwards compatibility */
131 if (asprintf(&fname, "%s/MACHINE.SID", lp_private_dir()) == -1) {
132 SAFE_FREE(sam_sid);
133 return NULL;
134 }
135
136 if (read_sid_from_file(fname, sam_sid)) {
137 /* remember it for future reference and unlink the old MACHINE.SID */
138 if (!secrets_store_domain_sid(global_myname(), sam_sid)) {
139 DEBUG(0,("pdb_generate_sam_sid: Failed to store SID from file.\n"));
140 SAFE_FREE(fname);
141 SAFE_FREE(sam_sid);
142 return NULL;
143 }
144 unlink(fname);
145 if ( !IS_DC ) {
146 if (!secrets_store_domain_sid(lp_workgroup(), sam_sid)) {
147 DEBUG(0,("pdb_generate_sam_sid: Failed to store domain SID from file.\n"));
148 SAFE_FREE(fname);
149 SAFE_FREE(sam_sid);
150 return NULL;
151 }
152 }
153
154 /* Stored the old sid from MACHINE.SID successfully.*/
155 SAFE_FREE(fname);
156 return sam_sid;
157 }
158
159 SAFE_FREE(fname);
160
161 /* we don't have the SID in secrets.tdb, we will need to
162 generate one and save it */
163 generate_random_sid(sam_sid);
164
165 if (!secrets_store_domain_sid(global_myname(), sam_sid)) {
166 DEBUG(0,("pdb_generate_sam_sid: Failed to store generated machine SID.\n"));
167 SAFE_FREE(sam_sid);
168 return NULL;
169 }
170 if ( IS_DC ) {
171 if (!secrets_store_domain_sid(lp_workgroup(), sam_sid)) {
172 DEBUG(0,("pdb_generate_sam_sid: Failed to store generated domain SID.\n"));
173 SAFE_FREE(sam_sid);
174 return NULL;
175 }
176 }
177
178 return sam_sid;
179}
180
181/* return our global_sam_sid */
182DOM_SID *get_global_sam_sid(void)
183{
184 struct db_context *db;
185
186 if (global_sam_sid != NULL)
187 return global_sam_sid;
188
189 /*
190 * memory for global_sam_sid is allocated in
191 * pdb_generate_sam_sid() as needed
192 *
193 * Note: this is garded by a transaction
194 * to prevent races on startup which
195 * can happen with some dbwrap backends
196 */
197
198 db = secrets_db_ctx();
199 if (!db) {
200 smb_panic("could not open secrets db");
201 }
202
203 if (db->transaction_start(db) != 0) {
204 smb_panic("could not start transaction on secrets db");
205 }
206
207 if (!(global_sam_sid = pdb_generate_sam_sid())) {
208 db->transaction_cancel(db);
209 smb_panic("could not generate a machine SID");
210 }
211
212 if (db->transaction_commit(db) != 0) {
213 smb_panic("could not start commit secrets db");
214 }
215
216 return global_sam_sid;
217}
218
219/**
220 * Force get_global_sam_sid to requery the backends
221 */
222void reset_global_sam_sid(void)
223{
224 SAFE_FREE(global_sam_sid);
225}
226
227/*****************************************************************
228 Check if the SID is our domain SID (S-1-5-21-x-y-z).
229*****************************************************************/
230
231bool sid_check_is_domain(const DOM_SID *sid)
232{
233 return sid_equal(sid, get_global_sam_sid());
234}
235
236/*****************************************************************
237 Check if the SID is our domain SID (S-1-5-21-x-y-z).
238*****************************************************************/
239
240bool sid_check_is_in_our_domain(const DOM_SID *sid)
241{
242 DOM_SID dom_sid;
243 uint32 rid;
244
245 sid_copy(&dom_sid, sid);
246 sid_split_rid(&dom_sid, &rid);
247 return sid_check_is_domain(&dom_sid);
248}
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